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參數(shù)資料
| 型號： | XRT5897 |
| 廠商： | Exar Corporation |
| 英文描述： | Seven-Channel E1 Line Interface (3.3V or 5.0V)(七通道E1 3.3V線接口單元) |
| 中文描述： | 七通道E1線路接口（3.3V或5.0V），（七通道素E1 3.3線接口單元） |
| 文件頁數(shù)： | 17/20頁 |
| 文件大小： | 959K |
| 代理商： | XRT5897 |
XRT5897
17
Rev. 1.10
Output Transformer Selection
A 1:2ratiotransformeris recommendedforboth75
and120
operationbecausethe transmitter, whenequippedwith
this device, meets both the ITU G.703 output pulse amplitude requirement and, the ETSI return loss specification.
Althoughacenter--tappedoutputtransformeris notrequired,choosing apartwitha center-tappedsecondaryallows the
use of the same type of unit at the receiver input.
A theoretical justification for the 1:2 ratio transformer follows:
Figure 8. Transmitter Line Driver Model
VS
pos
VS
neg
RS
neg
TRING
R4
R
L
R3
RS
pos
V
O
TTIP
1:n
Where:
Vs
pos
= Vs
neg
= 1.25V typical (Differential line driver peak output voltage swing)
Rs
pos
= Rs
neg
= 0.8
typical (Differential line driver internal source resistance)
R3 = R4 = 9.1
(Differential line driver external source resistance from
Figure 1
)
R
L
= 75
or 120
(Transmitter load resistance)
n = 2 (Transformer turns ratio)
Vo = Transmitter peak output voltage (Measured across R
L
= 75
or R
L
= 120
)
Figure 9
may be converted to a single--ended model:
Figure 9. Single-ended Line Driver Model
R
L
RS
ext
RS
int
1:n
V
O
V
S
Where:
VS =
Vs
pos
+
Vs
neg
RS
int
= RS
pos
+ Rs
neg
RS
ext
= R3 + R4
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| XR-T5990CP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Pulse Telephone Dialer |
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